Stadium: Court 1 Round: 44 Ground: Clay
| ITF - M15 Ulčinj | 2021/09/14 08:00 | Karl Friberg v Petar Jovanovic | 6-3,6-0 |
| ITF - M15 Ulčinj | 2021/09/07 08:00 | Juan Pablo Paz v Petar Jovanovic | 7-6,1-6,6-2 |
| ITF - M15 Ulčinj | 2021/08/30 07:30 | Tomislav Jotovski v Petar Jovanovic | 6-4,6-3 |
| ITF - M15 Novi Sad | 2021/08/02 08:00 | Domagoj Biljesko v Petar Jovanovic | 6-3,6-1 |
| ITF - M15 Novi Sad | 2021/08/01 11:15 | Marko Stakusic v Petar Jovanovic | 5-7,3-6 |
| ITF - M15 Doboj | 2021/07/12 11:00 | Petar Jovanovic v Carles Hernandez | 6-3,3-6,4-10 |
| ITF - M15 Doboj | 2021/07/11 12:30 | Petar Jovanovic v Tadija Radovanovic | 6-3,6-2 |
| Davis Cup | 2021/06/26 07:55 | Petar Jovanovic v Nadir Sargsyan | 6-0,6-2 |
| ITF - M15 Bad Waltersdorf | 2021/08/31 08:20 | Alen Rogic-Hadzalic v Niklas Waldner | 1-6,6-1,10-3 |
| ITF - M15 Bad Waltersdorf | 2021/08/30 09:00 | Niklas Waldner v Lukas Rohseano | 7-6,7-5 |
| ITF - M15 Warmbad-Villach | 2021/08/15 15:30 | Niklas Waldner v Rafael Kis Balazs | 4-6,5-7 |
| ITF - M25 Bolzano | 2021/08/02 11:50 | Filippo Moroni v Niklas Waldner | 6-2,6-2 |
| ITF - M25 Kottingbrunn | 2021/07/20 12:10 | Niklas Waldner v David Poljak | 7-6,2-6,6-7 |
| ITF - M25 Telfs | 2021/07/11 09:00 | Jakub Katuch v Niklas Waldner | 1-6,3-6 |
| ITF - M25 Most | 2021/05/24 09:00 | Niklas Waldner v Edward Hubner | 4-6,3-6 |
| ITF - M25 Most | 2021/05/23 08:00 | Niklas Waldner v Milos Karol | 3-6,7-5,10-3 |